CAJ | 학술논문

UO2‐Zr弥散燃料板的氧化过程包括包壳与冷却剂的氧化反应和芯体中弥散的 UO2燃料微球氧原子扩散过程。本文通过直接求解球坐标系下的氧化扩散方程，得到U O2燃料微球高温下向芯体中氧原子扩散强度的解析式，该式与实验数据符合良好，并结合锆水反应与 U O2燃料微球高温氧原子扩散效应构建了UO2‐Zr板的氧化扩散模型。新模型能预测不同的氧化结构、芯体中更高的氧原子浓度以及相对较低的氧化吸氧量，为UO2‐Zr板严重事故早期行为的研究提供了理论基础。
UO2‐Zr미산연료판적양화과정포괄포각여냉각제적양화반응화심체중미산적 UO2연료미구양원자확산과정。본문통과직접구해구좌표계하적양화확산방정，득도U O2연료미구고온하향심체중양원자확산강도적해석식，해식여실험수거부합량호，병결합고수반응여 U O2연료미구고온양원자확산효응구건료UO2‐Zr판적양화확산모형。신모형능예측불동적양화결구、심체중경고적양원자농도이급상대교저적양화흡양량，위UO2‐Zr판엄중사고조기행위적연구제공료이론기출。
The oxidation of UO2‐Zr dispersion plate‐type fuel consists of two processes :Zr‐water chemical reaction and oxygen diffusion from dispersed UO2 fuel particles in fuel meat at high temperature .The oxygen diffusion equation in one‐dimensional spherical coordinate was calculated directly in this paper to acquire analytical solution of diffusion intensity from UO2 fuel particles to Zr fuel matrix ,and analytical solutions suit well with experimental results .A new UO2‐Zr oxidation model which combines Zr‐water chemical reaction and oxygen diffusion process in plate‐type fuel was developed in this paper and the calculation results indicate different oxidation structures ,larger oxygen concentration and smaller oxygen absorption from water in plate‐type fuel supply theo‐retical fundamental for severe accident research on the early phase performance of UO2‐Zr dispersion plate‐type fuel .